Great tip, by reducing the size of the source images and using your UV distort set it was possible to do this. Moving the source image then animated the warp and setting the set's alpha to 0 enabled keying it in another multi-view. I never thought non linear effects would be possible in vMix but it's been lurking there all the time! Now a live source in a set can be curved to match the set. Imagine being able to animate the UV files / warp with an image sequence.
Thanks so much for this.

How do the colours in the png files relate to the mapping ?

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I updated the link to include an http:\\ thank's for point that out

@Peter B - The red value delineates x source pixel and the green value delineates y source pixel so 0,0,0 draws from pixel 0,0 of the original footage 255,255,0 (UV maps are 16 bit so they don't use the 8 bit numbers I'm posting here but 8 bit is easier to wrap your head around) equals pixel 1920x1080 in a full HD source. So, you can get pretty crazy with what you can do in terms of effects.

Yes, an animated version would be even more mindblowing. The original Tricaster had animated UV maps and one example effect I created was a syringe sucking the video up into the syringe (which you could see inside the syringe cylindrically mapped after).

Hi I'm new to this UV mapping stuff. Can you give a tutorial on how to create or edit an UV map? I tried to use adobe photoshop but can only export 32 bit PNG, which makes the video broken. Can't find a software that can export 64 bit PNG :(

thanks, will try it out

just tried open the uvmap file with Photoshop and export, still get 32bit image :(
i will try with Gimp later